I am praying for you and your dad. I just thought I would let you know that heart surgery has come along way. My Grandfather had major surgery (more than a quadruple bypass) and lived for almost 30 years afterwards, and my grandmother just had a pig valve put in when she was 86, and the man I am named after had to get a pacemaker (as you said about the oxygen his heart was functioning at 10%). I thought he wasn't going to make it and now after his surgery he is doing soo well. Much Love, Auntkerri